Fastener



FASTENER Filed March 5.

LUIZ W. rrsYn'ros', or sitoV PAULO, BRAZIL.

Patented Sept. ll, i923.

tienta f Innenraum.

i yApplication led March 5, 1921-. Serial No.` 449,824.

To a-ZZ wh'omz'zf mag/lcoacem: v

Be it known that'` I, 'LUIZ WHrrrLnsnY Vllirnnica, a citizen of Brazil, residing at f spectively and adapted to be easily and Yao readily Vconnected or Vdisconnected without liability of an accidental disengagement,

,constructed for giving a maximum holding capacity with a minimum thickness or depth, so that the Hap of an envelope or the like, will be securely connected with the overlapped side thereof, without increasing Vthe thi^kness of the envelope in an objectionable manner.

These objects may be attained by securing a peripherally groovedreye or post Vhead to one'of the members to be connected together." and byrsecuring an annulet madev of a flattenedhelical coil of spring wire to the other member, so' proportioned that the annulet must be sprung over the head or eye for engagement around the peripheral Y groove thereof.

Suc-h an embodiment of the invention is illustrated in two different forms in the accompanying drawings, forming in which- Figure lv is a fragmentary side elevation of an envelope showing an improved fastener with a coiled annulet having torsion' part hereof,

ally fiattened convolutions;

riphery on the outer side of the` envelope; `and the other' fastening part may be in the form of an annulet 4 composed of a helical spring having its convolutions 5 torsionally fiattened ina plane perpendicular to the axis of the annulet by deflecting them sidewise one vupon another as shown quite clearly in Fig; 2, the wires of the coil being twisted.

together as at 6, thence diverging in opposite directions and scoured to the edge 7 of the flap 8 of the, envelope. Y

The annulet thus formed is adapted to be sprungover the outer side of the eyehead for engagement in and disengagement from the peripheral groove thereof, and the torsional flattening of the convolutions not only reduces the tdepth or thickness of theV annulet, but increases its holding capacity as compared with an ordinary helical coil.

This form of the improvement is preferred for the smaller fasteners, it being evident that a very small helical coil made of comparatively fine spring wire canl be used, and that the thickness of the annulet does not exceed twice the thickness of the Wire, thus reducing to a minimum, the weight and thickness of this member of the fastener.

Referring to the different form of the invention shown in Figs. 3 and 4, one fastening partfmay be in the form of a post-head l secured to the side 2 of an envelope and having an annular groove 3 in its periphery on the outer side of the envelope; and the other fastening part may be in the form of an annulet 4 composed of a helical spring having its convolutions 5 flattened by a bending upon themselves of the inner and outer curves and a flattening of the side curves in a plane perpendicular to the axis of the annulet so as to give each convolution the form'of a flattened radial oval as well as appears in section in Fig. 4, the wires of the coil being twisted together as at G', thence extending and being secured by suitableclips 7 to the flap 8 of the envelope.

The annulet thus formed is likewise Vadapt to be sprung over the outer end of the inaXimunn Y :This form of the improvement-is pre-V ferred for the larger fasteners, it being evident that quite large helical coils made of Y vheavy spring Wire oa-nbe used, and that thethieknessof the annulet need not vexceed comprisinga head on one memberand an annulet on the other member composed of spring Wire helically coiled and flattened in aV plane perpendicular to the axis of the annuletor engagement With the head.

,2.1" A fastener for two separable members comprising ahead having a VperipheralV groove on one member land'Y an annulet on Ythe other member composed of spring Wire helically coiled and'flattened in a plane'per.- Y

pendicular totheaxis of the annule-t forenj` gagement in thegjifroovey of the head.

3. A fastener for twoseparable members comprising ahead onf onermember and an a-nnulet, on the other member Composed of spring Wire helically coiled and flattened inV a planev perpendicular tothe axisof the annulet byf bendinof upon itself to form `flat uti'ons: forengagement tened oval; convo withthe head. Y

In testimony that I olaimfthef-above, Il i have hereunto-subscribed my naine.v Y

UIZ W.T,IBYRICAL 

